KeyConverter.cs source code in C# .NET

                        Code:
                         / DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Base / System / Windows / Input / KeyConverter.cs / 1 / KeyConverter.cs
                        
                        
                            //---------------------------------------------------------------------------- 
//
// File: KeyConverter.cs
//
// Description: 
//
//      KeyConverter : Converts a key string to the *Type* that the string represents and vice-versa 
// 
// Features:
// 
// History:
//  05/28/2003       created: Chandrasekhar Rentachintala
//
// Copyright (C) 2003 by Microsoft Corporation.  All rights reserved. 
//
//--------------------------------------------------------------------------- 
 
using System;
using System.ComponentModel;    // for TypeConverter 
using System.Globalization;     // for CultureInfo
using System.Reflection;
using System.Windows;
using System.Windows.Input; 
using System.Windows.Markup;
using System.Security.Permissions; 
using MS.Utility; 

namespace System.Windows.Input 
{
    /// 
    /// Key Converter class for converting between a string and the Type of a Key
    ///  
    /// 
    public class KeyConverter : TypeConverter 
    { 
        /// 
        /// CanConvertFrom() 
        /// 
        /// 
        /// 
        ///  
        /// 
        public override bool CanConvertFrom(ITypeDescriptorContext context, Type sourceType) 
        { 
            if (sourceType == typeof(string))
            { 
                return true;
            }
            else
            { 
                return false;
            } 
        } 

        ///  
        /// TypeConverter method override.
        /// 
        /// ITypeDescriptorContext
        /// Type to convert to 
        /// true if conversion is possible
        public override bool CanConvertTo(ITypeDescriptorContext context, Type destinationType) 
        { 
            // We can convert to a string.
            // We can convert to an InstanceDescriptor or to a string. 
            if (destinationType == typeof(string))
            {
                // When invoked by the serialization engine we can convert to string only for known type
                if (context != null && context.Instance != null) 
                {
                    Key key = (Key)context.Instance; 
                    return ((int)key >= (int)Key.None && (int)key <= (int)Key.OemClear); 
                }
            } 
            return false;
        }

        ///  
        /// ConvertFrom()
        ///  
        ///  
        /// 
        ///  
        /// 
        /// 
        public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, object source)
        { 
            if (source is string)
            { 
                string fullName = ((string)source).Trim(); 
                object key = GetKey(fullName, CultureInfo.InvariantCulture);
                if (key != null) 
                {
                    return ((Key)key);
                }
                else 
                {
                    throw new NotSupportedException(SR.Get(SRID.Unsupported_Key, fullName)); 
                } 
            }
            throw GetConvertFromException(source); 
        }

        /// 
        /// ConvertTo() 
        /// 
        ///  
        ///  
        /// 
        ///  
        /// 
        /// 
        public override object ConvertTo(ITypeDescriptorContext context, CultureInfo culture, object value, Type destinationType)
        { 
            if (destinationType == null)
                throw new ArgumentNullException("destinationType"); 
 
            if (destinationType == typeof(string) && value != null)
            { 
                Key key = (Key)value;
                if (key == Key.None)
                {
                    return String.Empty; 
                }
 
                if (key >= Key.D0 && key <= Key.D9) 
                {
                    return Char.ToString((char)(int)(key - Key.D0 + '0')); 
                }

                if (key >= Key.A && key <= Key.Z)
                { 
                    return Char.ToString((char)(int)(key - Key.A + 'A'));
                } 
 
                String strKey = MatchKey(key, culture);
                if (strKey != null && (strKey.Length != 0 || strKey == String.Empty)) 
                {
                    return strKey;
                }
            } 
            throw GetConvertToException(value, destinationType);
        } 
 
        private object GetKey(string keyToken, CultureInfo culture)
        { 
            if (keyToken == String.Empty)
            {
                return Key.None;
            } 
            else
            { 
                keyToken = keyToken.ToUpper(culture); 
                if (keyToken.Length == 1 && Char.IsLetterOrDigit(keyToken[0]))
                { 
                    if (Char.IsDigit(keyToken[0]) && (keyToken[0] >= '0' && keyToken[0] <= '9'))
                    {
                        return ((int)(Key)(Key.D0 + keyToken[0] - '0'));
                    } 
                    else if (Char.IsLetter(keyToken[0]) && (keyToken[0] >= 'A' && keyToken[0] <= 'Z'))
                    { 
                        return ((int)(Key)(Key.A + keyToken[0] - 'A')); 
                    }
                    else 
                    {
                        throw new ArgumentException(SR.Get(SRID.CannotConvertStringToType, keyToken, typeof(Key)));
                    }
                } 
                else
                { 
                    Key keyFound = (Key)(-1); 
                    switch (keyToken)
                    { 
                        case "ENTER": keyFound = Key.Return; break;
                        case "ESC": keyFound = Key.Escape; break;
                        case "PGUP": keyFound = Key.PageUp; break;
                        case "PGDN": keyFound = Key.PageDown; break; 
                        case "PRTSC": keyFound = Key.PrintScreen; break;
                        case "INS": keyFound = Key.Insert; break; 
                        case "DEL": keyFound = Key.Delete; break; 
                        case "WINDOWS": keyFound = Key.LWin; break;
                        case "WIN": keyFound = Key.LWin; break; 
                        case "LEFTWINDOWS": keyFound = Key.LWin; break;
                        case "RIGHTWINDOWS": keyFound = Key.RWin; break;
                        case "APPS": keyFound = Key.Apps; break;
                        case "APPLICATION": keyFound = Key.Apps; break; 
                        case "BREAK": keyFound = Key.Cancel; break;
                        case "BACKSPACE": keyFound = Key.Back; break; 
                        case "BKSP": keyFound = Key.Back; break; 
                        case "BS": keyFound = Key.Back; break;
                        case "SHIFT": keyFound = Key.LeftShift; break; 
                        case "LEFTSHIFT": keyFound = Key.LeftShift; break;
                        case "RIGHTSHIFT": keyFound = Key.RightShift; break;
                        case "CONTROL": keyFound = Key.LeftCtrl; break;
                        case "CTRL": keyFound = Key.LeftCtrl; break; 
                        case "LEFTCTRL": keyFound = Key.LeftCtrl; break;
                        case "RIGHTCTRL": keyFound = Key.RightCtrl; break; 
                        case "ALT": keyFound = Key.LeftAlt; break; 
                        case "LEFTALT": keyFound = Key.LeftAlt; break;
                        case "RIGHTALT": keyFound = Key.RightAlt; break; 
                        case "SEMICOLON": keyFound = Key.OemSemicolon; break;
                        case "PLUS": keyFound = Key.OemPlus; break;
                        case "COMMA": keyFound = Key.OemComma; break;
                        case "MINUS": keyFound = Key.OemMinus; break; 
                        case "PERIOD": keyFound = Key.OemPeriod; break;
                        case "QUESTION": keyFound = Key.OemQuestion; break; 
                        case "TILDE": keyFound = Key.OemTilde; break; 
                        case "OPENBRACKETS": keyFound = Key.OemOpenBrackets; break;
                        case "PIPE": keyFound = Key.OemPipe; break; 
                        case "CLOSEBRACKETS": keyFound = Key.OemCloseBrackets; break;
                        case "QUOTES": keyFound = Key.OemQuotes; break;
                        case "BACKSLASH": keyFound = Key.OemBackslash; break;
                        case "FINISH": keyFound = Key.OemFinish; break; 
                        case "ATTN": keyFound = Key.Attn; break;
                        case "CRSEL": keyFound = Key.CrSel; break; 
                        case "EXSEL": keyFound = Key.ExSel; break; 
                        case "ERASEEOF": keyFound = Key.EraseEof; break;
                        case "PLAY": keyFound = Key.Play; break; 
                        case "ZOOM": keyFound = Key.Zoom; break;
                        case "PA1": keyFound = Key.Pa1; break;
                        default: keyFound = (Key)Enum.Parse(typeof(Key), keyToken, true); break;
                    } 

                    if ((int)keyFound != -1) 
                    { 
                        return keyFound;
                    } 
                    return null;
                }
            }
        } 

        private static string MatchKey(Key key, CultureInfo culture) 
        { 
            if (key == Key.None)
                return String.Empty; 
            else
            {
                switch (key)
                { 
                    case Key.Back: return "Backspace";
                    case Key.LineFeed: return "Clear"; 
                    case Key.Escape: return "Esc"; 
                }
            } 
            if ((int)key >= (int)Key.None && (int)key <= (int)Key.OemClear)
                return key.ToString();
            else
                return null; 
        }
    } 
} 


// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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